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dsa.h
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1 /* crypto/dsa/dsa.h */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
7  * The implementation was written so as to conform with Netscapes SSL.
8  *
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to. The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson ([email protected]).
15  *
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  *
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  * notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  * notice, this list of conditions and the following disclaimer in the
30  * documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  * must display the following acknowledgement:
33  * "This product includes cryptographic software written by
34  * Eric Young ([email protected])"
35  * The word 'cryptographic' can be left out if the rouines from the library
36  * being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from
38  * the apps directory (application code) you must include an acknowledgement:
39  * "This product includes software written by Tim Hudson ([email protected])"
40  *
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  *
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed. i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 
59 /*
60  * The DSS routines are based on patches supplied by
61  * Steven Schoch <[email protected]>. He basically did the
62  * work and I have just tweaked them a little to fit into my
63  * stylistic vision for SSLeay :-) */
64 
65 #ifndef HEADER_DSA_H
66 #define HEADER_DSA_H
67 
68 #include <openssl/e_os2.h>
69 
70 #ifdef OPENSSL_NO_DSA
71 #error DSA is disabled.
72 #endif
73 
74 #ifndef OPENSSL_NO_BIO
75 #include <openssl/bio.h>
76 #endif
77 #include <openssl/crypto.h>
78 #include <openssl/ossl_typ.h>
79 
80 #ifndef OPENSSL_NO_DEPRECATED
81 #include <openssl/bn.h>
82 #ifndef OPENSSL_NO_DH
83 # include <openssl/dh.h>
84 #endif
85 #endif
86 
87 #ifndef OPENSSL_DSA_MAX_MODULUS_BITS
88 # define OPENSSL_DSA_MAX_MODULUS_BITS 10000
89 #endif
90 
91 #define DSA_FLAG_CACHE_MONT_P 0x01
92 #define DSA_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DSA
93  * implementation now uses constant time
94  * modular exponentiation for secret exponents
95  * by default. This flag causes the
96  * faster variable sliding window method to
97  * be used for all exponents.
98  */
99 
100 /* If this flag is set the DSA method is FIPS compliant and can be used
101  * in FIPS mode. This is set in the validated module method. If an
102  * application sets this flag in its own methods it is its reposibility
103  * to ensure the result is compliant.
104  */
105 
106 #define DSA_FLAG_FIPS_METHOD 0x0400
108 /* If this flag is set the operations normally disabled in FIPS mode are
109  * permitted it is then the applications responsibility to ensure that the
110  * usage is compliant.
111  */
112 
113 #define DSA_FLAG_NON_FIPS_ALLOW 0x0400
114 
115 #ifdef __cplusplus
116 extern "C" {
117 #endif
118 
119 /* Already defined in ossl_typ.h */
120 /* typedef struct dsa_st DSA; */
121 /* typedef struct dsa_method DSA_METHOD; */
122 
123 typedef struct DSA_SIG_st
124  {
128 
130  {
131  const char *name;
132  DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
133  int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
134  BIGNUM **rp);
135  int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
136  DSA_SIG *sig, DSA *dsa);
137  int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
138  BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
139  BN_MONT_CTX *in_mont);
140  int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
141  const BIGNUM *m, BN_CTX *ctx,
142  BN_MONT_CTX *m_ctx); /* Can be null */
143  int (*init)(DSA *dsa);
144  int (*finish)(DSA *dsa);
145  int flags;
146  char *app_data;
147  /* If this is non-NULL, it is used to generate DSA parameters */
148  int (*dsa_paramgen)(DSA *dsa, int bits,
149  const unsigned char *seed, int seed_len,
150  int *counter_ret, unsigned long *h_ret,
151  BN_GENCB *cb);
152  /* If this is non-NULL, it is used to generate DSA keys */
153  int (*dsa_keygen)(DSA *dsa);
154  };
156 struct dsa_st
157  {
158  /* This first variable is used to pick up errors where
159  * a DSA is passed instead of of a EVP_PKEY */
160  int pad;
161  long version;
163  BIGNUM *p;
164  BIGNUM *q; /* == 20 */
166 
167  BIGNUM *pub_key; /* y public key */
168  BIGNUM *priv_key; /* x private key */
170  BIGNUM *kinv; /* Signing pre-calc */
171  BIGNUM *r; /* Signing pre-calc */
173  int flags;
174  /* Normally used to cache montgomery values */
176  int references;
178  const DSA_METHOD *meth;
179  /* functional reference if 'meth' is ENGINE-provided */
180  ENGINE *engine;
181  };
183 #define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
184  (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
185 #define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
186  (unsigned char *)(x))
187 #define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
188 #define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
189 
190 
191 DSA *DSAparams_dup(DSA *x);
192 DSA_SIG * DSA_SIG_new(void);
193 void DSA_SIG_free(DSA_SIG *a);
194 int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
195 DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
196 
197 DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
198 int DSA_do_verify(const unsigned char *dgst,int dgst_len,
199  DSA_SIG *sig,DSA *dsa);
200 
201 const DSA_METHOD *DSA_OpenSSL(void);
202 
203 void DSA_set_default_method(const DSA_METHOD *);
205 int DSA_set_method(DSA *dsa, const DSA_METHOD *);
206 
207 DSA * DSA_new(void);
208 DSA * DSA_new_method(ENGINE *engine);
209 void DSA_free (DSA *r);
210 /* "up" the DSA object's reference count */
211 int DSA_up_ref(DSA *r);
212 int DSA_size(const DSA *);
213  /* next 4 return -1 on error */
214 int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
215 int DSA_sign(int type,const unsigned char *dgst,int dlen,
216  unsigned char *sig, unsigned int *siglen, DSA *dsa);
217 int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
218  const unsigned char *sigbuf, int siglen, DSA *dsa);
219 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
221 int DSA_set_ex_data(DSA *d, int idx, void *arg);
222 void *DSA_get_ex_data(DSA *d, int idx);
223 
224 DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
225 DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
226 DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
227 
228 /* Deprecated version */
229 #ifndef OPENSSL_NO_DEPRECATED
231  unsigned char *seed,int seed_len,
232  int *counter_ret, unsigned long *h_ret,void
233  (*callback)(int, int, void *),void *cb_arg);
234 #endif /* !defined(OPENSSL_NO_DEPRECATED) */
235 
236 /* New version */
237 int DSA_generate_parameters_ex(DSA *dsa, int bits,
238  const unsigned char *seed,int seed_len,
239  int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
240 
241 int DSA_generate_key(DSA *a);
242 int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
243 int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
244 int i2d_DSAparams(const DSA *a,unsigned char **pp);
245 
246 #ifndef OPENSSL_NO_BIO
247 int DSAparams_print(BIO *bp, const DSA *x);
248 int DSA_print(BIO *bp, const DSA *x, int off);
249 #endif
250 #ifndef OPENSSL_NO_FP_API
251 int DSAparams_print_fp(FILE *fp, const DSA *x);
252 int DSA_print_fp(FILE *bp, const DSA *x, int off);
253 #endif
254 
255 #define DSS_prime_checks 50
256 /* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
257  * 50 rounds of Rabin-Miller */
258 #define DSA_is_prime(n, callback, cb_arg) \
259  BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
260 
261 #ifndef OPENSSL_NO_DH
262 /* Convert DSA structure (key or just parameters) into DH structure
263  * (be careful to avoid small subgroup attacks when using this!) */
264 DH *DSA_dup_DH(const DSA *r);
265 #endif
267 #define EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits) \
268  EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, \
269  EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL)
270 
271 #define EVP_PKEY_CTRL_DSA_PARAMGEN_BITS (EVP_PKEY_ALG_CTRL + 1)
272 #define EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS (EVP_PKEY_ALG_CTRL + 2)
273 #define EVP_PKEY_CTRL_DSA_PARAMGEN_MD (EVP_PKEY_ALG_CTRL + 3)
274 
275 /* BEGIN ERROR CODES */
276 /* The following lines are auto generated by the script mkerr.pl. Any changes
277  * made after this point may be overwritten when the script is next run.
278  */
281 /* Error codes for the DSA functions. */
283 /* Function codes. */
284 #define DSA_F_D2I_DSA_SIG 110
285 #define DSA_F_DO_DSA_PRINT 104
286 #define DSA_F_DSAPARAMS_PRINT 100
287 #define DSA_F_DSAPARAMS_PRINT_FP 101
288 #define DSA_F_DSA_DO_SIGN 112
289 #define DSA_F_DSA_DO_VERIFY 113
290 #define DSA_F_DSA_GENERATE_KEY 124
291 #define DSA_F_DSA_GENERATE_PARAMETERS_EX 123
292 #define DSA_F_DSA_NEW_METHOD 103
293 #define DSA_F_DSA_PARAM_DECODE 119
294 #define DSA_F_DSA_PRINT_FP 105
295 #define DSA_F_DSA_PRIV_DECODE 115
296 #define DSA_F_DSA_PRIV_ENCODE 116
297 #define DSA_F_DSA_PUB_DECODE 117
298 #define DSA_F_DSA_PUB_ENCODE 118
299 #define DSA_F_DSA_SIGN 106
300 #define DSA_F_DSA_SIGN_SETUP 107
301 #define DSA_F_DSA_SIG_NEW 109
302 #define DSA_F_DSA_SIG_PRINT 125
303 #define DSA_F_DSA_VERIFY 108
304 #define DSA_F_I2D_DSA_SIG 111
305 #define DSA_F_OLD_DSA_PRIV_DECODE 122
306 #define DSA_F_PKEY_DSA_CTRL 120
307 #define DSA_F_PKEY_DSA_KEYGEN 121
308 #define DSA_F_SIG_CB 114
310 /* Reason codes. */
311 #define DSA_R_BAD_Q_VALUE 102
312 #define DSA_R_BN_DECODE_ERROR 108
313 #define DSA_R_BN_ERROR 109
314 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100
315 #define DSA_R_DECODE_ERROR 104
316 #define DSA_R_INVALID_DIGEST_TYPE 106
317 #define DSA_R_MISSING_PARAMETERS 101
318 #define DSA_R_MODULUS_TOO_LARGE 103
319 #define DSA_R_NEED_NEW_SETUP_VALUES 110
320 #define DSA_R_NON_FIPS_DSA_METHOD 111
321 #define DSA_R_NO_PARAMETERS_SET 107
322 #define DSA_R_PARAMETER_ENCODING_ERROR 105
323 
324 #ifdef __cplusplus
325 }
326 #endif
327 #endif